<!DOCTYPE html>
<html>
	<head>
		<meta charset="UTF-8">
		<title></title>
		<style>
			.box{
				width:300px;
				height:300px;
				background:red;
				margin:20px;
			}
			.box1{
				padding:50px;
				border:10px solid yellow;
				box-sizing: border-box;
			}
		</style>
	</head>
	<body>
		<div class="box box1">123</div>
		<div class="box box2">123</div>
	</body>
</html>
